I....don't know exactly what you're asking for in the first but to answer the second one:
Go talk to the alchemist in town.
that’s what I’m talking about, I don’t know where is the place in town
Where's what in town? The Sewers? The Docks?
look for wooden sigh hanging at one house with text "potions" then enter front door and talk to alchemist. Should be easily visible from starting are
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